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® WorleyParsons <br /> resources&energy <br /> The CTG and STG will be capable of remote automatic generator control and will be <br /> supplied with metering quality CTs, PTs and meters capable of supplying signals to the <br /> DCS and performance monitoring systems. <br /> 4.6 Generator Step-up Transformer (GSUT) <br /> A single 3-winding, delta-wye, ONAN/ONAF/ONAF 65°C rise GSU transformer will <br /> connect the CTG and the STG to the 230kV system. The neutral point of the HV winding <br /> of each transformer will be solidly grounded. The GSU transformer will have metal oxide <br /> surge arresters adjacent to the HV terminals. <br /> Transformer accessories will include a magnetic liquid-level gauge, pressure-relief device, <br /> buckholz relay, oil preservation device, valves for top and bottom filter press connections, <br /> drain/sampling valves, grounding pads, bushing-mounted current transformers, <br /> combustible gas detector, and hot spot winding temperature elements. <br /> The GSUT will include a manual de-energized tap changer located in the HV winding with <br /> taps ranging from 5 percent above normal to 5 percent below normal in 2.5 percent <br /> increments. The tap changer will have manual locking provisions. <br /> GSU transformer auxiliaries will be powered from a 480V, three-phase source. <br /> 4.7 Unit Auxiliary Transformers (UAT) <br /> Two (2) 18kV-4.36kV two-winding delta-wye ONAN/ONAF 65°C UAT will be provided <br /> to serve all plant auxiliary electric loads. Each UAT will be rated to supply facility startup <br /> and maximum operating power requirements. The neutral point of each 4160V UAT will <br /> be low-resistance grounded. <br /> Transformer accessories will include a magnetic liquid-level gauge, pressure-relief device, <br /> sudden pressure relay, oil preservation device, valves for top and bottom filter press <br /> connections, drain/sampling valves, grounding pads, bushing-mounted current <br /> transformers, and hot spot winding temperature elements. <br /> Each UAT will include a manual de-energized tap changer located in the HV winding with <br /> taps ranging from 5 percent above normal to 5 percent below normal in 2.5 percent <br /> increments. <br /> 4.8 Secondary Unit Substation Transformer (SUS) <br /> Multiple 4.16-0.48kV two-winding delta-wye ONAN/ONAF 55°/65°C SUS transformers <br /> will be provided to serve the 480V switchgear and all 480V plant auxiliary electric loads. <br /> The SUS transformers will be rated to supply facility startup and maximum operating <br /> power requirements. The neutral point of the 480V SUS transformers will be high- <br /> resistance grounded with a ground fault detection scheme consisting of a pulsing contactor <br /> Lodi Energy Center 3.4-4 LEC AFC <br /> 071608 Rev.A <br />